Open file with default app in Ruby

gistfile1.rb

def open_with_default_app path_to_file
	if is_windows?
		%x{start /MIN #{path_to_file}}
	elsif is_mac?
		%x{open -g \"#{path_to_file}\"}
	elsif is_linux?
		%x{xdg-open \"#{path_to_file}\"}
	else
		puts "Platform not supported: #{RUBY_PLATFORM}"
	end
end

def is_mac?
	RUBY_PLATFORM.downcase.include?("darwin")
end
def is_windows?
	RUBY_PLATFORM.downcase.include?("mswin") || RUBY_PLATFORM.downcase.include?("mingw")
end
def is_linux?
	RUBY_PLATFORM.downcase.include?("linux")
end